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Exploring the Enterprise Network Infrastructure   Introducing Routing and Switching in the Enterprise   – Chapter 2
Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Interpret Network Documentation ,[object Object],[object Object],[object Object],[object Object]
Interpret Network Documentation ,[object Object],[object Object],[object Object]
Enterprise Network Documentation ,[object Object],[object Object],[object Object],[object Object]
 
Describe the Equipment in the Enterprise NOC
Describe the Equipment in the Enterprise NOC
Structured Cabling
Telecommunications Room (IDF MDF)
Telecommunications: Power to end Users
Summary: Telecommunications
Enterprise Edge & the Provisioning of Services
Enterprise Edge & the Provisioning of Services
Connecting the Enterprise
Summary: Connections
Distribution Layer: Routers
Identify Router Hardware Characteristics
Router Connections
Use Router CLI Show Commands
Router: Show CLI commands
Use Basic Router Configuration Commands ,[object Object],[object Object],[object Object],[object Object],[object Object]
Basic router configuration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Identify Switch Hardware Characteristics
Switch Hardware
Use Switch CLI Show Commands
Switch CLI commands
Use Switch CLI Configuration Commands   ,[object Object],[object Object],[object Object]
Quiz question
Chapter 2 tasks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]
 

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D3_Chapter 2_routing and switching in the enterprise

Editor's Notes

  1. Network infrastructure diagrams, or topology diagrams , keep track of the location, function, and status of devices. Topology diagrams represent either the physical or logical network. A physical topology map uses icons to document the location of hosts, networking devices, and media. It is important to maintain and update physical topology maps to aid future installation and troubleshooting efforts. A logical topology map groups hosts by network usage, regardless of physical location. Host names, addresses, group information, and applications can be recorded on the logical topology map. Connections between multiple sites may be shown but do not represent actual physical locations. Control plane information describes failure domains and defines the interfaces where different network technologies intersect.
  2. Graphic: 2.1.1.2
  3. The NOC usually has: Raised floors to allow for cabling and power to run under the floor to the equipment High performance UPS systems and air conditioning equipment to provide a safe operating environment for equipment Fire suppression systems integrated into the ceiling Network monitoring stations, servers, backup systems, and data storage Access layer switches and distribution layer routers , if it serves as a Main Distribution Facility (MDF) for the building or campus where it is located
  4. Servers in the NOC are usually clustered together, creating a server farm. The server farm is frequently considered as a single resource but, in fact, provides two functions: backup and load balancing. If one server fails or becomes overloaded, another server takes over. The servers in the farm may be rack-mounted and interconnected by very high-speed switches (Gigabit Ethernet or higher). They may also be blade servers mounted in a chassis and connected by a high-speed backplane within the chassis. Another important aspect of the enterprise NOC is high-speed, high-capacity data storage . This data storage, or network attached storage (NAS), groups large numbers of disk drives that are directly attached to the network and can be used by any server. A NAS device is typically attached to an Ethernet network and is assigned its own IP address. A more sophisticated version of NAS is Storage Area Network (SAN ). A SAN is a high-speed network that interconnects different types of data storage devices over a LAN or WAN.
  5. Structured cabling creates an organized cabling system that is easily understood by installers, network administrators, and any other technicians who work with cables. Cable management serves many purposes. First, it presents a neat and organized system that aids in isolating cabling problems. Second, best cabling practices protect the cables from physical damage and EMI, which greatly reduces the number of problems experienced. To assist in troubleshooting: All cables should be labelled at both ends, using a standard convention that indicates source and destination. All cable runs should be documented on the physical network topology diagram. All cable runs, both copper and fiber, should be tested end-to-end by sending a signal down the cable and measuring loss. Cabling standards specify a maximum distance for all cable types and network technologies. For example, the IEEE specifies that, for Fast Ethernet over unshielded twisted pair (UTP), the cable run from switch to host cannot be greater than 100 meters (approximately 328 ft). If the cable run is greater than the recommended length problems could occur with data communications, especially if the terminations at the ends of the cable are poorly completed. Documentation of the cable plan and testing are critical to network operations.
  6. The telecommunications room is also referred to as a wiring closet or intermediate distribution facility (IDF). It contains the Access Layer networking devices and ideally maintains environmental conditions similar to the NOC, such as air conditioning and UPS. Many IDFs connect to a Main Distribution Facility (MDF) using an extended star design. The MDF is usually located in the NOC or centrally located within the building. MDFs are typically larger than IDFs. They house high-speed s witches, routers, and server farms. The central MDF switches may have enterprise servers and disk drives connected using gigabit copper links. IDFs contain lower-speed switches , APs, and hubs. The switches in the IDFs typically have large numbers of Fast Ethernet ports for users to connect at the Access Layer. The switches in the IDF usually connect to the switches in the MDF with Gigabit interfaces . This arrangement creates backbone connections, or uplinks. These backbone links, also called vertical cabling , may be copper or fiber-optic. Copper Gigabit or Fast Ethernet links are limited to a maximum of 100 meters and should use CAT5e or CAT6 UTP cable. Fiber-optic links can run much greater distances. d because they do not conduct electricity, they are immune to lightning strikes, EMI, RFI, and differential grounds. Fiber-optic links commonly interconnect buildings an
  7. In addition to providing basic network access connectivity, it is becoming more common to provide power to end-user devices directly from the Ethernet switches in the telecommunications room . These devices include IP phones, access points, and surveillance cameras. These devices are powered using the PoE provides power to a device over the same twisted pair cable that carries data. This allows an IP phone, for instance, to be located on a desk IEEE 802.3af standard, Power over Ethernet, or PoE. without the need for a separate power cord or a power outlet. In order to support PoE devices such as the IP phone, the connecting switch must have PoE capability. PoE can also be provided by power injectors or PoE patch panels for those switches which do not support PoE.
  8. At the outer edge of the enterprise network is the Point-of-Presence (POP) which provides an entry point for services to the enterprise network. Externally-provided services coming in through the POP include Internet access, wide area connections, and telephone services (PSTN). The POP contains a point of demarcation, or the demarc . The demarc provides a boundary that designates responsibility for equipment maintenance and troubleshooting between the service provider (SP) and customer. Equipment from the service provider up to the point of demarcation is the responsibility of the provider; anything past the demarc point is the responsibility of the customer. In an enterprise, the POP provides links to outside services and sites. The POP may provide a direct link to one or more ISPs , which allows internal users the required access to the Internet. The remote sites of an enterprise are also interconnected through the POPs. The service provider establishes the wide area links between these remote sites. The location of the POP and the point of demarcation: While they are often located within the MDF of the customer, they may also be located at the ISP.
  9. Large enterprises usually consist of multiple sites that interconnect. Multiple locations may have edge connections at each site connecting the enterprise to other individuals and organizations. The edge is the point of entry for outside attacks and is a point of vulnerability . Attacks at the edge can affect thousands of users. For example, Denial of Service (DoS) attacks prevent access to resources for legitimate users inside or outside the network, affecting productivity for the entire enterprise. All traffic in or out of the organization goes through the edge . Edge devices must be configured to defend against attacks and provide filtering based on website, IP address, traffic pattern, application, and protocol. An organization can deploy a firewall, and security appliances with intrusion detection system (IDS) and intrusion prevention system (IPS) at the edge to protect the network. Virtual private networks (VPNs), access control lists (ACLs), user IDs, and passwords provide access for internal maintenance and software installation.. VPNs also allow remote workers access to internal resources.
  10. The network connection services commonly purchased by an enterprise include leased lines, T1/E1 or business class, Frame Relay, and ATM. Physical cabling brings these services to the enterprise using copper wires, as in the case of T1/E1, or fiber-optic cable for higher-speed services. The POP must contain certain pieces of equipment to obtain whichever WAN service is required. For example, to obtain T1/E1 service, the customer may require a punchdown block to terminate the T1/E1 circuit, as well as a Channel Service Unit / Data Service Unit (CSU/DSU) to provide the proper electrical interface and signaling for the service provider. This equipment may be owned and maintained by the service provider or may be owned and maintained by the customer. Regardless of ownership, all equipment located within the POP at the customer site is referred to as Customer Premise Equipment (CPE).
  11. Download this file from the portal. D3_chap 2_connecting to external devices
  12. Without the routing process, packets could not leave the local network. What you already know about routers : The router provides access to other private networks as well as to the Internet. All hosts on a local network specify the IP address of the local router interface in their IP configuration. This router interface is the default gateway. Routers use the network portion of the destination IP address to route packets to the proper destination. They select an alternate path if a link goes down or traffic is congested. Routers play a critical role in networking by interconnecting multiple sites within an enterprise network , providing redundant paths, and connecting ISPs on the Internet. Routers can also act as a translator between different media types and protocols. For example, a router can re-encapsulate packets from an Ethernet to a Serial encapsulation. Routers also serve other beneficial functions : Provide broadcast containment Connect remote locations Group users logically by application or department Provide enhanced security (using NAT and ACLs)
  13. Routers come in many shapes and sizes called form factors. Network administrators in an enterprise environment should be able to support a variety of routers and switches, from a small desktop to a rack-mounted or blade model. Routers can also be categorized as fixed configuration or modular . With the fixed configuration, the desired router interfaces are built-in. Modular routers come with multiple slots that allow a network administrator to change the interfaces on the router.
  14. Two methods exist for connecting a PC to a network device for configuration and monitoring tasks: out-of-band and in-band management. Out-of-band management is used for initial configuration or when a network connection is unavailable . Configuration using out-of-band management requires: Direct connection to console or AUX port and Terminal emulation client In-band management is used to monitor and make configuration changes to a network device over a network connection . Configuration using in-band management requires: At least one network interface on the device to be connected and operational and Telnet, SSH, or HTTP to access a Cisco device
  15. Graphic: 2.3.2.1
  16. On line curriculum 2.3.3.2
  17. Packet tracer lab: Basic router CLI configuration
  18. The main function of switches is to connect hosts such as end user workstations, servers, IP phones, web cameras, access points and routers. This means that there are many more switches in an organization than routers. Switches come in many form factors: Small standalone models sit on a desk or mount on a wall. Integrated routers include a switch built into the chassis that is rack mounted. High-end switches mount into a rack and are often a chassis and blade design to allow more blades to be added as the number of users increases.
  19. An enterprise switch in an MDF connects other switches from IDFs using Gigabit fiber or copper cable . An IDF switch typically needs both RJ-45 Fast Ethernet ports for device connectivity and at least one Gigabit Ethernet port (copper or fiber) to uplink to the MDF switch. Some high-end switches have modular ports that can be changed if needed. For example, it might be necessary to switch from multimode fiber to single mode fiber, which would require a different port. Like routers, switch ports are also designated using the controller/port or controller/slot/port conventions. For example, using the controller/port convention, the first Fast Ethernet port on a switch is numbered as Fa0/1 (controller 0 and port 1). The second is Fa0/2. The first port on a switch that uses controller/slot/port is Fa0/0/1. Gigabit ports are designated as Gi0/1, Gi0/2 etc. Port density on a switch is an important factor. In an enterprise environment where hundreds or thousands of users need switch connections, a switch with a 1RU height and 48-ports has a higher port density than a 1RU 24-port switch.
  20. See 2.3.5 Online curriculum
  21. Packet Tracer switch lab Handout: Switch commands